Brake-controlling valve device



' sept 10, 1929 J. M. J. DoRMoY 1,727,367

BHAKECONTROLLING VALVE DEVICE Filed Feb. 20, 1928 JULES MARIE JOSEPH DORMOY ATTORNEY Patented Sept.. 10, 1929.

. UNITED STATES PATENT oFl-ucE.:l

JULES MARIE JOSEPH DORMOY, O F PARIS, FRANCE, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, F WILMERDIN G, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

BRAKE-CONTROLLING VALVE DEVICE.

Application led February 20, 1928, Serial No. 255,702, and in France July 18, 19.27.

This invention relates to control valves for fluid pressure lbraking apparatus and particularly although not exclusively to valves of this character adapted for use on auto.-

mobile brakes operated by vacuum, the -inkvention having for its object to provide an improved construction of control valve of the kind in which the pressure obtaining d within the brake cylinder of the apparatus may be accurately and definitely graduated in Iaccordance with the effort exerted upon the control element of the valve,

As usually constructed a. control valve of the character above indicated comprises two lvalve elements, one of which is adapted to Icontrol communication between the brake cylinder Voi the apparatus and ther induction pipe of the engine of the vehicle or a source of fluid under pressure, the other valve controlling communication between the brake cylinder and the atmosphere. i

According to the principal feature of the invention the latter valve is constituted by a resilient element preferably in the form of a rubber or leather valve dlsc mounted upon the other valve which is preferably of the ordinary poppet type constructed of metal.

The invention is illustrated by way of eX- ample in the accompanying drawings, Figure l of which is a sectional view of a preferred construction of control valve embodying the invention and mounted upon one end of the brake' cylinder, the various parts of the valve being shown in their released position, in which communication is established between the brake cylinder and the atmosphere. Figure 2 isa view similar to Figure 1 but illustrating the control valve fin ,its lap position; Figure 3 being a similar view showing the valve in sition. 1

Referring now to the drawings, it will be seen that the control valve is mounted on one end of the brake cylinder 1 the brake cylinfull application po? phere through ports 9.

. The sleeve "10 so as der lhead 2 being formed integral 'with the' lower bodyr portion 3 .of the control valve.

A flexible diaphragm 4 constructed of any phragm' 4 being in communication with the Y brake cylinder through suitable apertures 7 in the cylinder head 2, while the space 8 above the diaphragm 4 in the interior of the cap 5 1s 1n communication lwith the atmos- The central part of the diaphragm 4 is secured to a cylindrical slide within the upper portion of the cap 5, the outer end of which is closed b a cover 11 through which the control mem er12 of the valve passes. pivotally connected outside the cover 1l to one end` of an arm 13 the opposite end of which is pivotally mounted as indicated at 14 on a bracket 15 secured to the cover 11.

The memberl 12 is thus guided and supported by the arm 13 and during itsliniited range of movement moves through an arc of relatively small extent. The lower end of the memberx-12 passes' through the open end# of the sleeve l0 and carrles a conical collar 16 between the flanged edge 17 of which, and the inturned upper edge 18 of the collar 10 a cylindrical spring 1-9 is interposed. A second cylindrical spring 20 is interposed between the outwardly anged lower edge of the sleeve 10\ and the upper part ofthe cap 5. 10 is secured to the diaphragm by means of a collar'21 which is `screwthreaded on to the lower edge 'of the sleeve to clamp the diaphra m, 4 to the sleeve, anvinner flange 22 on t e collar 21 constituting the valve seat for a valve disc 23 composed of rubber,- leather or -other suit-- able material. The valve disc 23v is mounted on the upper end of a poppet valve 24 plovided with a valve seat formed vin the upper edge 'of a cylindrical projection -25 formed integral with the cylinder head 2,

The control member 12 is sleeve 10 adapted to A light springl 27' is interposed between valve' disc A23. I,

The operation of the controlivalve is as follows Y f So long as the parts offthe valvelare in the collar 16and the upper surface ofthe l the release position shown in Figurel, the

' control member 12 being at the lowest point of its travel, the poppet valve 24 is in enagement with its seat in the cylindrical pro- ]ection 25 and the diaphragm 4 being in its lowermost position the valve seat 22 on the 'collar 21 is out of engagement with the valve disc 23.

Communication between the brake cylinp der and the atmosphere is thus 'established valve 24 still remains in engagement with its valve seat. As a result the brake cylinder is closed, communication with the cylinder past the valve disc 23 being cut ott.

Further upward movement of the control member 12 towards the position shown in Flgure 3'causes the spring 19 to beofurtlier compressed to raise the sleeve 10 and the diaphragm 4 causing the poppet valve 24 tol be lifted from its seatA by the upward movement of the valve disc 23 to which the valve 24 is connected and as a result communication is established between thebrake cylinder and the induction pipe of the engine past the open valve 24 to the space 26 within the cylindrical projection 25.

The vacuum conditions thus established within the brake cylinder tend to cause the diaphragm 4 rto be moved downwards against the upward effort exerted by the controlling member 12 and when the vacuum established in the brake cylinder corresponds to the e'ort exerted on the member 12 the diaphragm 4 will move downwards to the position shown in Figure 2 lthereby cutting off communication between the induction'pipe and the brake cylinder and maintaining corresponding pressure conditionsv within the brake cylinder.

In the event of the eiort on the control member 12 being decreased the diaphragm.

4 willmove upwards thus permitting the valve 24 to be seated and atmospheric air to be admitted to the brake cylinder past the valve disc 23 which is out lof engagement with its valve seat 22.

The construction of the valve element controlling communicationl between the brake cylinder 1, and the atmosphere as above described, in the form of a resilient valve disc evidently permits a certain over-lap between the .opening and closing action of the two valves so that during a limited range of movement of the control Ymember 12 and of .the diaphragm 4 both Avalves will remain closed thereby preventing pulsation and irregular action of the valves in operation. The invention is evidently not limited to precise Constructional arrangement tle a ove described which may be varied iny many respects without exceeding the scope of the invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. In a vacuum brake, the combination with a brake cylinder, ofl a valve for controlling lcommunication from a vacuum source to the brake cylinder, a flexible valve for controlling communication from the atmosphere to said brake cylinder, and means for operating said valves.

2. In a vacuum brake, the combination with a brake cylinder, of a valve for controlling communication froma vacuum source to the brake cylinder, a valve otresilient material for controlling communication from the atmosphere to said brake cylinder, and means for operating said valves.

3. In a vacuum brake, the combination with a brake cylinder, of a valve for controlling communication from a vacuum source to the brake cylinder, a valve of rubber for controlling communication from -tlie atmosphere to said brake cylinder, and means for operating said valves.

4. In a vacuum brake, the combination with a brake cylinder, of a metallic poppet valve for controlling communication froma vacuum source to the brake cylinder, a valvev mounted on said metallic valve and formed of resilient material for* controlling communication Vfrom the atmosphere to the brake cylinder, and means for operating said valves.

5. In a vacuum'brake, the combination with a brake cylinder, of a metallic poppet valve for controlling communication from a vacuum source to the brake cylinder, a disk valve of iexible material mounted on' said metallic valve for controlling communication from the atmosphere to the brake cylinder, and means for operating said valves.

In testimony whereof I have hereunto set myA hand and seal this 4 day of February,

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